<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity {
    /**
     * Authenticates a user.
     * The example implementation makes sure if the username and password
     * are both 'demo'.
     * In practical applications, this should be changed to authenticate
     * against some persistent user identity storage (e.g. database).
     * @return boolean whether authentication succeeds.
     */
    public function authenticate() {
        $salt = Yii::app()->dbConfig->salt;
        $username = strtolower($this->username);
        $password = $this->password;
        $user=Users::model()->findByUsername($username);
        if(null === $user) {
            $this->errorCode=self::ERROR_USERNAME_INVALID;
        }
        else if(!$user->checkPassword($password)) {
            $this->errorCode = self::ERROR_PASSWORD_INVALID;
        }
        else {
            $this->errorCode=self::ERROR_NONE;
        }
        return !$this->errorCode;
    }
}